How can I contact the Costco Corporate Offices? We are happy to call Washington state our home. Visit our corporate offices at: 999 Lake Drive Issaquah, WA 98027 Or, write us at our mailing address: Costco Wholesale P.O. Box 34331 Seattle, WA 98124 Finally, feel free to call us at 425-313-8100. We’re available Monday–Friday, 8 a.m.–5 p.m. PT.
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